package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面 公共字段自动填充
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void AutoFillPointCut(){}

    //前置通知 进行公共字段赋值
    @Before("AutoFillPointCut()")
    public void AutoFill(JoinPoint joinPoint){
        log.info("进行公共字段自动填充...");
        //获取被拦截的方法的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
        AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);//获得注解对象
        OperationType value = annotation.value();//获得数据库操作类型

        //获取被拦截的方法的参数
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0) return;

        Object arg = args[0];

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据不同的操作类型 为对应属性赋值
        if(value == OperationType.INSERT){
            //插入赋值四个公共字段
            try {
                Method setCreateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值
                setCreateTime.invoke(arg,now);
                setCreateUser.invoke(arg,currentId);
                setUpdateTime.invoke(arg,now);
                setUpdateUser.invoke(arg,currentId);
            } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
                throw new RuntimeException(e);
            }
        }else{
            //UPDATE赋值两个公共字段
            try {
                Method setUpdateTime = arg.getClass().getDeclaredMethod("setUpdateTime",LocalDateTime.class);
                Method setUpdateUser = arg.getClass().getDeclaredMethod("setUpdateUser", Long.class);

                //通过反射为对象属性赋值
                setUpdateTime.invoke(arg,now);
                setUpdateUser.invoke(arg,currentId);
            } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
                throw new RuntimeException(e);
            }
        }
    }
}
